Capt. Fred'k Whittaker
3 appearances across 3 restored issues — every one readable in full, free.
Beadle's New York Dime Library, No. 108 — 1880 “The Duke of Diamonds; Or The Flower of Calcutta” · p.1 Read the full issue (24 pages) → 
Beadle's Dime Library No. 913 — 1896 “Dakota George, the Dead-Shot; or, The Half-Breed of the Hills” · p.2 Read the full issue (32 pages) → 
The Dime Library, No. 1052 — 1901 “The Duke of Diamonds: The Flower of Calcutta” (serial) · p.1 Read the full issue (24 pages) → Appearances are extracted from each issue's own printed contents page; entries we can't read confidently are withheld rather than guessed.